he Ultimate Auto-Start Battery. The best Heavy Hitters vaping experience, in a quick and easy package. The Heavy Hitters Auto-Start Battery is a convenient, fire-and-forget companion for your favorite Heavy Hitters 510 thread cartridges. Easy To Use | 5-Second Time Out | For Use With Bottom Airflow 510 Thread Cartridges Pro Tips: LED on battery will flash if battery level is too low for operation Store battery in a cool, dry place out of direct sunlight Battery will automatically time out after five seconds of vaporization Compatible with all 510 thread cartridges, USB charger included How To Use: 1. To charge, twist the threaded end of the battery into charging port on the charger. 2. Plug the USB end of the charger into a compatible power source. 3. The indicator light will illuminate red during charging and green when a full charge is complete. 4. To use the battery, twist off the battery from the charger and twist on your favorite Heavy Hitters 510 cartridge and enjoy.